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Diodes Incorporated SMAJ64A-13
- Part No.:
- SMAJ64A-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ64A-13.pdf
- Description:
- TVS DIODE 64VWM 103VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:6,317
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Product details
Overview
SMAJ64A-13 from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode with 64V reverse standoff voltage, 71.1–78.6V breakdown range at 1mA, and 103V max clamping voltage at 3.9A peak pulse current. It features glass-passivated die construction, UL 94V-0 molded plastic case, and is rated for -55°C to +150°C operation - deployed in DC power rail protection for industrial PLC I/O modules.
For engineers reviewing the SMAJ64A-13 datasheet, SMAJ64A-13 pinout, SMAJ64A-13 application, or SMAJ64A-13 equivalent, key selection criteria include clamping voltage margin vs. protected IC VDD, peak pulse current capability under 8.3ms half-sine surge, unidirectional polarity alignment with DC bias, and SMA package thermal dissipation limits at TL = 75°C.
Technical Context
This TVS operates as a fast-acting shunt clamp: under normal bias (VRWM ≤ 64V), leakage stays ≤5µA; when transient exceeds VBR (min 71.1V), it avalanches within <1ps to limit voltage to ≤103V at 3.9A. Its glass-passivated junction ensures stable breakdown and low capacitance (≈100pF at 0V).
The device is rated for 400W non-repetitive peak pulse power (8.3ms half-sine, 4 pulses/minute max), derates linearly above 25°C ambient, and sustains 40A forward surge (8.3ms) without failure - enabling robust protection against IEC 61000-4-5 Level 3 surges on 24V/48V control lines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - withstands IEC 61000-4-5 combination wave (1.2/50μs voltage, 8/20μs current) up to 400W for single event |
| Reverse Standoff Voltage | 64V - maximum continuous DC operating voltage before significant leakage; sets upper bound for protected line voltage |
| Breakdown Voltage | 71.1–78.6V @ 1mA - guaranteed avalanche initiation window; ensures reliable turn-on before downstream IC damage threshold |
| Max Clamping Voltage | 103V @ 3.9A - peak voltage seen by protected circuit during worst-case 8.3ms surge; defines safe margin over 75V system rails |
| Leakage Current | ≤5µA @ 64V - negligible standby power loss and signal integrity impact on high-impedance sensing nodes |
| Junction Temp Range | -55°C to +150°C - supports operation in sealed enclosures, motor drive cabinets, and outdoor industrial environments |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with cathode band marking; dimensions: 4.00–4.60mm length × 2.29–2.92mm width × 1.27–1.63mm height; UL 94V-0 rated; weight ≈0.064g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; completes shunt path during transient |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., 24V supply); polarity-sensitive for unidirectional operation |
Key Features
| Feature | Design Value |
|---|---|
| 400W Peak Pulse Rating | Enables single-device protection against 1kV/500A IEC 61000-4-5 surges on 24V systems without series impedance |
| Glass-Passivated Junction | Ensures repeatable, low-drift breakdown voltage and long-term reliability under thermal cycling |
| SMA Surface-Mount Package | Supports automated assembly and provides adequate thermal mass for 1.0W steady-state dissipation at TL = 75°C |
| RoHS-Compliant Finish | Matte tin plating meets JEDEC J-STD-020C solderability requirements and EU Directive Annex exemptions |
Applications
| Industrial PLC Digital Input Protection | 48V Telecom Power Interface |
|---|---|
Use Scenario: 24V DC digital input channel exposed to field wiring-induced transients in factory automation cabinets. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between input terminal and ground, clamping induced surges before they reach optocoupler input stage. Use Value: Limits voltage to ≤103V during 8.3ms surges, preserving optocoupler CTR and preventing latch-up in upstream MCU GPIO. | Use Scenario: Primary-side surge protection on 48V DC feed entering telecom remote radio unit (RRU) enclosure. IC Role / Device Role / Timing Role: First-line transient clamp on main power rail, coordinated with downstream π-filter and secondary TVS array. Use Value: Absorbs up to 400W of surge energy without degradation, maintaining <5µA leakage to avoid battery drain in standby mode. |
| Automotive Body Control Module (BCM) Power Rail | Smart Meter AC/DC Auxiliary Supply |
Use Scenario: 12V/24V power input protection in BCM subassembly subjected to load dump per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Unidirectional TVS mounted directly at connector entry point, referenced to chassis ground. Use Value: Clamps 35V–60V load dump transients to ≤103V within <1ps, protecting PMIC input stage and avoiding brownout reset. | Use Scenario: Secondary-side 64V-rated DC output of meter's auxiliary SMPS exposed to coupling from mains surge events. IC Role / Device Role / Timing Role: Final-stage clamp on isolated DC bus feeding metrology SoC and RTC backup circuitry. Use Value: Maintains ≤5µA leakage at 64V to preserve 10-year RTC battery life while clamping coupled transients to safe levels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ64CA-13 | Bi-directional version; symmetric ±64V standoff; higher capacitance (~150pF) | Required for AC-coupled or bipolar signal lines (e.g., RS-485, CAN FD); not suitable for DC-biased rails | Select only if bidirectional clamping is mandated by signal polarity reversal or AC waveform presence |
| SMBJ64A-13 | Same electrical specs but SMB package (larger footprint, higher PPK = 600W, improved thermal resistance) | Better suited for high-volume industrial PCBs where layout space allows larger footprint and higher surge margin is needed | Choose when 600W rating or lower junction-to-lead thermal resistance (<15°C/W) is required for repeated surge exposure |
Compared with SMAJ64CA-13 and SMBJ64A-13, SMAJ64A-13 offers optimal balance of compact SMA footprint, precise unidirectional clamping, and verified 400W surge handling - ideal for space-constrained 24V/48V DC power inputs where polarity is fixed and board area is premium.
Availability
SMAJ64A-13 is available at Aetrix Electronics and suitable for industrial PLC I/O protection, telecom 48V power interfaces, automotive BCM power rails, and smart meter auxiliary supplies requiring stable component supply across multi-year production cycles.
Supply support for SMAJ64A-13 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability protection, power management, and signal integrity solutions for industrial, automotive, and communications markets.
SMAJxxA series belongs to Diodes' transient voltage suppressor portfolio, engineered specifically for robust, surface-mount surge protection on DC power lines and low-speed signal paths in harsh electromagnetic environments.
FAQ
What is the polarity configuration of SMAJ64A-13?
SMAJ64A-13 is a unidirectional TVS diode, with cathode marked by a band on the SMA package body. It conducts only when the cathode is biased positive relative to the anode - making it suitable for DC power rail protection where polarity is fixed and reverse voltage is not expected.
Does SMAJ64A-13 meet RoHS requirements?
Yes - SMAJ64A-13 uses matte tin lead finish and complies with RoHS Directive 2011/65/EU, including exemptions for high-melting-temperature solder and glass in semiconductor devices per Annex III. Full compliance documentation is available via Diodes Incorporated's product change notices.
How does SMAJ64A-13 perform under repeated surge stress?
Per JEDEC test conditions, SMAJ64A-13 is rated for ≤4 pulses per minute at full 400W peak power. Repeated surges beyond this duty cycle cause thermal accumulation, reducing clamping consistency; for cyclic surge environments, derating curves in Figure 1 must be applied to maintain reliability.
Can SMAJ64A-13 replace SMAJ64CA-13 in a circuit?
No - SMAJ64A-13 is unidirectional and cannot substitute for the bi-directional SMAJ64CA-13 in AC or polarity-reversing applications. Swapping introduces risk of catastrophic failure during negative transients, as the unidirectional device blocks reverse conduction entirely.
SMAJ64A-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AC, SMA
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 64V
- Voltage - Breakdown (Min):
- 71.1V
- Voltage - Clamping (Max) @ Ipp:
- 103V
- Current - Peak Pulse (10/1000µs):
- 3.9A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
SMAJ64A-13 FAQ
1.How can I place an order for SMAJ64A-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ64A-13 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SMAJ64A-13 reliable?
The price and inventory of SMAJ64A-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ64A-13 is usually 5 days.
3.What payment methods are accepted for SMAJ64A-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ64A-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ64A-13?
SMAJ64A-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ64A-13 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SMAJ64A-13?
For technical support, including SMAJ64A-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ64A-13 requirements.
6.How does Aetrix verify that SMAJ64A-13 is sourced from the original manufacturer or authorized distributors?
All SMAJ64A-13 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SMAJ64A-13 meets industry standards.
7.What is the process for return or replacement of SMAJ64A-13?
All SMAJ64A-13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ64A-13, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SMAJ64A-13 part is unused and in its original packaging.
Return procedure for SMAJ64A-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ64A-13 Tags
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